Though the wide universe is full of good, kernel of nourishing corn can come to (man) (only through) his own toil (bestowed) that plot of ground which is given him (to till).（）

(A favorite story) among (acoustic) experts (concerns w...

单项选择题(A favorite story) among (acoustic) experts (concerns with) a noisy Long Island suburb where, every day and night, huge trucks (rumbled down) a freeway.（）

The subject may (be approached in) several directions, ...

单项选择题The subject may (be approached in) several directions, but (the scene) cannot be fully (from) any (one vantage) point.（）

This discrepancy (was intriguing to) Alfred Wegener, a ...

单项选择题This discrepancy (was intriguing to) Alfred Wegener, a young geologist (working in) Greenland in 1910. He thought (the error) too great to be (accounted) easily.（）